code: def testCompositionStats(self):
      rlt = rl_tuner.RLTuner(
          self.output_dir,
          note_rnn_checkpoint_dir=self.checkpoint_dir,
          output_every_nth=30,
      )
      stat_dict = rlt.evaluate_music_theory_metrics(num_compositions=10)
  
      self.assertTrue(stat_dict["num_repeated_notes"] >= 0)
      self.assertTrue(len(stat_dict["autocorrelation1"]) > 1)
  
file_path: magenta/magenta/models/rl_tuner/rl_tuner_test.py
imports: import os
  import os.path
  import tempfile
  from magenta.models.rl_tuner import note_rnn_loader
  from magenta.models.rl_tuner import rl_tuner
  import matplotlib
  import matplotlib.pyplot
  import tensorflow.compat.v1
label_desc: Use image node_id 8 for calling the RLTunerTest obj's underlying member method code with example usage: obj.testCompositionStats() without return types